73621 has 4 divisors (see below), whose sum is σ = 74592. Its totient is φ = 72652.

The previous prime is 73613. The next prime is 73637. The reversal of 73621 is 12637.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 73621 - 2³ = 73613 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (73651) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 361 + ... + 526.

It is an arithmetic number, because the mean of its divisors is an integer number (18648).

2⁷³⁶²¹ is an apocalyptic number.

It is an amenable number.

73621 is a deficient number, since it is larger than the sum of its proper divisors (971).

73621 is an equidigital number, since it uses as much as digits as its factorization.

73621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 970.

The product of its digits is 252, while the sum is 19.

The square root of 73621 is about 271.3319000781. The cubic root of 73621 is about 41.9115675233.

It can be divided in two parts, 736 and 21, that added together give a palindrome (757).

The spelling of 73621 in words is "seventy-three thousand, six hundred twenty-one".